Fire alarm



Nov. 24, 1925. 1,563,279

' F. P. HAR'IILEY FIRE ALARM Filed May 19, 1924 n Svi/DMO@ TMre-LZ@ @Roz/M0410 Patented Nov. 24, 1925. A

UNITED STATES ,y 1,563,279 PATENT' OFFICE.

FRANK 1. HARTLEY, OF BANGOR, MAINE.

man ALARM.

Application filed may 19,1924'. seriai No. 714,435.

To all 'whom t may con-cern: v

Beit known that I, FRANK?. I-IAn'rLEY, a citizen -of the United States, residing at Bangor, in the count of Penobscot and State of Maine, have invented certain new and useful Improvements in Fire Alarms;

and I do declare the 'following to be a full,`y clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use theh same.

6 invention relates to improvements in thermostatically controlled fire alarms, andl it is the principal object of the invention to provide an exce tionally simple and inexpensive, yet 'a re iable construction, in which a thermostat acts directly upon a spring arm which normally Iholds a .spring-actuatedl 'clapper against operation, 'said thermostat being adapted to release the spring and per-` mit operation of the'clapper against a gong,

when the temperature rises to a predetermined extent.

Another object' isv to provide a construction which may well be used also for com .let' .ing an-electric circuit to. operate a visib e or audible alarm at a remote point.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawing.

Figure 1 is a front elevation partly broken away, showing one form of the invention.

Figure 2 is a view similar to Fig. 'l but illustrating a did'erent form of construction.

l In the drawing above briefly described,

the numeral 1 ldesignates a spring motory having a vertical upwardly extendin back late 2 whose upper end is pre erably ormed with an opening to receive a suspending hook or the like.A The motor 1 inl cludes .a toothed' wheel/1 for operating l:a

clap er 5 to sound oa gcng' 6, w ich gong 'pre erably forms a housing for the motor 1 and may well be mounted upon the winding shaft 7 thereof, to be used in place of akey when winding the spring ofthe motor.

f The clapper 5 is shown as mounted upon a rock shaft 8 havin a lateral arm 9 which contacts normally with the lower side of a spring arm 10, said arm l1() being suitably secured at 11 to the framepstructure of the spring motor 1;y As long as 'the arm 1 0 is in contact with the arm9, the clapper 5 is held against operation, but provide a therand a thermostat mounted on-sai mostatfor raising said arm 10 under a predetermined rise in temperature, so that the clapper pimmediately comes into play upon the gon 6.

In Fgig. 1, a mounted directly uponrthe spring motor 1 under the free end ofthe arm 10, to thrust directly against and raise said arm at the proper time. yIn Fig. 2, a spiral thermostat 13 has been shown with its inner end sedisk-like thermostat 12 is cured to a post 14 which extends forwardly v from the upwardly projecting portion of the back plate 2, the outer endl of said thermostat being bent laterally outward as' indicated at 15 under the arm 10. Under a predetermined degreev of heat, the thermostat/ 13 unwinds and thus lifts the spring 10 to permit operation of the clapper 5.

lIn either'form of construction shown, the arm 10 may be utilized for the purpose of completing an electric ,circuit to operate a remote alarm, whether audible or visible..

Such an alarm hasbeen illustrated in the form of a belll 16 whosecircuit includes wires 17 a battery 18, anda pair of normally se arated contacts 19, oneof these contacts being inthe upward path of the arm 10, so that the latter will move it against the other contact to complete the circuit of the alarm 16.-

This showing is merely illustrative of one of the many waysfin which the arm 10 may be made to com lete an electric circuit.

From-the oregoing, it will be seen that a 'simple and inexpensive, yet a practical and reliable device has been provided, and as excellent results are obtainable from the details disclosed these details ,are preferably ,followed.n owever, within the scope of the invention as claimed, numerous minor changes ma be made.

claim:

L1. An alarm comprising a gong,l a pivoted l clapper co-o rable with said gong and hav 2. An alarm comprising a gong, a pivoted clapper c0-0perable With said gong, a spring motor for actuating said clapper7 said motor having a projecting back plate, a spring arm mounted on said motor and normally engaging said clapper to hold the latter against operation7 a post extending rigidly from the projecting portion of said back plate adf ]a-cent the free end of said spring arm, and a spiral thermostat anchored at its inner end to said post, the outer end of said thermostat bein bent laterally 'outward and engaging the ree end of said spring arm, whereby to automatically release the latter upon a predetermined rise in temperature. y

In testimony whereof I have hereunto affixed my'signature.

FRANK P. HARTLEY. 

